7139997 has 6 divisors (see below), whose sum is σ = 10313342. Its totient is φ = 4759992.

The previous prime is 7139971. The next prime is 7139999. The reversal of 7139997 is 7999317.

It can be written as a sum of positive squares in only one way, i.e., 6081156 + 1058841 = 2466^2 + 1029^2 .

It is not a de Polignac number, because 7139997 - 2⁶ = 7139933 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7139999) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 396658 + ... + 396675.

Almost surely, 2^7139997 is an apocalyptic number.

It is an amenable number.

7139997 is a deficient number, since it is larger than the sum of its proper divisors (3173345).

7139997 is a wasteful number, since it uses less digits than its factorization.

7139997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 793339 (or 793336 counting only the distinct ones).

The product of its digits is 107163, while the sum is 45.

The square root of 7139997 is about 2672.0772818165. The cubic root of 7139997 is about 192.5599700712.

It can be divided in two parts, 7 and 139997, that multiplied together give a palindrome (979979).

The spelling of 7139997 in words is "seven million, one hundred thirty-nine thousand, nine hundred ninety-seven".